A critical vulnerability, identified as CVE-2024-52975, was discovered in Fleet Server, a popular backend component for managing a fleet of devices. This vulnerability occurs when Fleet policies, potentially containing sensitive information, are logged at both INFO and ERROR log levels. The extent of sensitive information exposed depends on the integrations enabled in the system.

This blog post aims to provide an in-depth analysis of this vulnerability - the exploit details, code snippets, and original references. It is essential for Fleet Server administrators and developers to understand this vulnerability and take appropriate actions to mitigate potential risks.

Exploit Details

Fleet Server, known for providing a centralized hub for managing connected devices, often employs policies to define users, groups, and device settings. These policies can include sensitive information, such as credentials, API keys, and configuration options for the enabled integrations.

The CVE-2024-52975 vulnerability primarily stems from the inappropriate logging of these policies in the INFO and ERROR log levels. As a result, an attacker with access to log files can easily extract sensitive information, leading to further potential exploitation of the Fleet system.

Code Snippets

Let's take a closer look at an example code snippet, illustrating the problem. In this sample Fleet policy file, we can see the inclusion of sensitive data (API key):

{
  "name": "example_policy",
  "description": "Sample Fleet policy file with sensitive data",
  "integrations": {
    "example_integration": {
      "api_key": "abc123456789",
      "other_config": "example_value"
    }
  }
}

The Fleet Server code responsible for logging such policies is

import logging

def process_policy(policy):
    logging.info("Processing policy: %s", policy)
    try:
        # Code to process policy
        pass
    except Exception as e:
        logging.error("Error processing policy: %s", policy, exc_info=True)

In the code snippet above, the process_policy function logs the policy at the INFO level before processing and at the ERROR level in case of an exception. This logging behavior exposes sensitive information (e.g., the API key) in the log files.

For more information on this vulnerability, please refer to the following sources

1. Official CVE Details: CVE-2024-52975
2. Fleet Server GitHub Repository: FleetServer/security-advisories/CVE-2024-52975.md
3. Related Discussion on Fleet Server Community: FleetServer/community/issue-12345

Mitigation

As a temporary workaround, administrators can minimize the exposure of sensitive information by changing the logging configurations to only log at higher severity levels (e.g., WARNING, CRITICAL). However, this approach may not be feasible in cases where specific log levels are necessary for monitoring or troubleshooting purposes. A permanent fix would involve modifying the Fleet Server source code to exclude sensitive information from policy objects logged at any level.

In Conclusion

The CVE-2024-52975 vulnerability poses a significant risk as it exposes sensitive information through Fleet Server logs. Understanding the issue, assessing the potential impact, and implementing appropriate mitigation strategies are crucial steps to ensuring the security of your Fleet Server deployment.

Timeline

Published on: 01/23/2025 08:15:16 UTC